Comcast, General Electric and NBC Universal claim their new joint venture entity won’t dominate the TV market — declaring it ranks fourth among media companies in terms of its advertising and affiliate revenue.

The proposed $28 billion entity will have only a 12 percent share of advertising and affiliate revenue in the national cable market — and will sit behind Disney, Time Warner and Viacom and only just ahead of News Corp. (owner of The Post), Comcast claimed in a 327-page filing with the Federal Communications Commission in response to the regulator’s request for information.

That ranking is surprising given that NBC Universal houses some of the most profitable cable stations around. They include USA Network, regularly a No. 1 network in terms of audience, which Bernstein Research estimated would earn $1.7 billion in revenue in 2010, and CNBC, which makes profits in excess of $300 million.

Among the companies other assets are Bravo, Oxygen and Comcast’s E! and sports network Versus.

In the filing submitted late yesterday, Comcast argued its proposal to buy a 51 percent stake in NBC Universal from GE should be approved because it would “accelerate investment and innovation and promote competition and benefit consumers.”